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Critical period revisited: impact on vision
Hirofumi Morishita1, Takao K Hensch
1Children's Hospital Boston, Harvard Medical School, Boston, MA 02115, USA.
Current Opinion in Neurobiology
|June 7, 2008
Summary
Visual deprivation causes permanent vision loss, but residual brain plasticity offers hope for adult recovery. Interventions targeting brain plasticity mechanisms may restore vision later in life.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Neural circuits undergo critical period development, significantly shaped by early life experiences.
- Monocular deprivation in early life leads to permanent vision loss (amblyopia) and structural changes in the visual cortex.
- This developmental plasticity is typically confined to a specific early postnatal window.
Purpose of the Study:
- To investigate the potential for recovery of visual function in adulthood.
- To explore mechanisms underlying the persistence of neural plasticity beyond critical periods.
- To identify therapeutic targets for treating amblyopia in adults.
Main Methods:
- Review of recent rodent studies on visual cortex plasticity.
- Analysis of molecular and cellular mechanisms influencing excitatory-inhibitory balance.
- Examination of factors affecting structural plasticity in the adult brain.
Main Results:
- Rodent studies show residual subthreshold potentiation of visual responses persists throughout life.
- Manipulating excitatory-inhibitory balance or removing molecular brakes can enhance plasticity.
- These interventions may reopen critical period-like plasticity in adulthood.
Conclusions:
- Adult brains retain a latent capacity for plasticity that can be pharmacologically or environmentally manipulated.
- Understanding critical period mechanisms provides a basis for novel therapeutic strategies for amblyopia.
- Interventions targeting plasticity offer promising avenues for vision recovery in adults.
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